diff --git a/cmd/pkgserver/ui/static/test.scss b/cmd/pkgserver/ui/static/test.scss
index 28d7044..1d9a2d5 100644
--- a/cmd/pkgserver/ui/static/test.scss
+++ b/cmd/pkgserver/ui/static/test.scss
@@ -17,6 +17,9 @@ details.test-node {
 p.test-desc {
     margin: 0 0 0 1rem;
     padding: 2px 0;
+    > pre {
+        margin: 0;
+    }
 }
 
 .italic {
diff --git a/cmd/pkgserver/ui/static/test.ts b/cmd/pkgserver/ui/static/test.ts
index af4cc3f..7bb507d 100644
--- a/cmd/pkgserver/ui/static/test.ts
+++ b/cmd/pkgserver/ui/static/test.ts
@@ -176,16 +176,10 @@ export class StreamReporter implements Reporter {
 
         for (const [path, tests] of pathMap) {
             if (tests.length === 1) {
-                const t = tests[0];
-                const pathStr = path ? `${path} ❯ ` : "";
-                const output = t.output ? `: ${t.output}` : "";
-                this.stream.writeln(`${pathStr}${t.name}${output}`);
+                this.#writeOutput(tests[0], path ? `${path} ❯ ` : "", false);
             } else {
                 this.stream.writeln(path);
-                for (const t of tests) {
-                    const output = t.output ? `: ${t.output}` : "";
-                    this.stream.writeln(`  - ${t.name}${output}`);
-                }
+                for (const t of tests) this.#writeOutput(t, "  - ", true);
             }
         }
 
@@ -193,6 +187,20 @@ export class StreamReporter implements Reporter {
         const { successes, failures } = this.counts;
         this.stream.writeln(`${successes} succeeded, ${failures} failed`);
     }
+
+    #writeOutput(test: { name: string } & TestResult, prefix: string, nested: boolean) {
+        let output = "";
+        if (test.output) {
+            const lines = test.output.split("\n");
+            if (lines.length <= 1) {
+                output = `: ${test.output}`;
+            } else {
+                const padding = nested ? "      " : "  ";
+                output = ":\n" + lines.map((line) => padding + line).join("\n");
+            }
+        }
+        this.stream.writeln(`${prefix}${test.name}${output}`);
+    }
 }
 
 export class DOMReporter implements Reporter {
@@ -228,9 +236,9 @@ export class DOMReporter implements Reporter {
         const p = document.createElement("p");
         p.classList.add("test-desc");
         if (result.output) {
-            const code = document.createElement("code");
-            code.appendChild(document.createTextNode(result.output));
-            p.appendChild(code);
+            const pre = document.createElement("pre");
+            pre.appendChild(document.createTextNode(result.output));
+            p.appendChild(pre);
         } else {
             p.classList.add("italic");
             p.appendChild(document.createTextNode("No output."));